package ywpt.core.util;
import java.io.IOException;
import javax.servlet.*;
public class SetCharacterEncodingFilter implements Filter {
	protected String		encoding;
	protected FilterConfig	filterConfig;
	protected boolean		ignore;
	public SetCharacterEncodingFilter() {
		encoding = null;
		filterConfig = null;
		ignore = true;
	}
	public void destroy() {
		encoding = null;
		filterConfig = null;
	}
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);
			if (encoding != null) {
				request.setCharacterEncoding(encoding);
			}
		}
		chain.doFilter(request, response);
	}
	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		encoding = filterConfig.getInitParameter("encoding");
		String value = filterConfig.getInitParameter("ignore");
		if (value == null) {
			ignore = true;
		} else if (value.equalsIgnoreCase("true")) {
			ignore = true;
		} else if (value.equalsIgnoreCase("yes")) {
			ignore = true;
		} else {
			ignore = false;
		}
	}
	protected String selectEncoding(ServletRequest request) {
		return encoding;
	}
}
